Even though I'm kinda new to Arduino, I'm a bit ashamed to ask something simple as USB communication here. Especially because there are loads of tutorials to be found online (even on the arduino.cc homepage)

But still... I haven't been able to get it to work =/

Just for starters, I want to have my arduino to send numbers/words to the PC, and read it in Java.Anyone have a good tutorial for that? one that does include Java example code?

He meant that he wants with the Arduino via serial port using Java as the in-between-er to fetch and send the data over the serial port to the Arduino. That, sir, can be done. He does not want to run Java code on the Arduino. He says:

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I want to have my arduino to send numbers/words to the PC, and read it in Java

Anyhow, here are a few links on how to start a serial connection on Java to read data from a serial port:http://www.java-samples.com/showtutorial.php?tutorialid=11andhttp://stackoverflow.com/questions/900950/how-to-send-data-to-com-port-using-java